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6 Answers
6

This answer assumes you are interested in dealing with Mexican pedestrians.

There is not a culture of sharing the road and sidewalks with cyclists. Cars and buses will take advantage of your slow speed, while pedestrians will feel you are taking more than your share of sidewalk. Thus, simply put, a standard rule for what you ask has never evolved.

The problem remains to warn people when you do risk it out there. ¡derecha! or ¡izquierda! are misleading. ¿Do I move to the right, or is someone passing on the right? The first thing that came to my mind was ¡cuidado a la derecha/izquierda! It is as short as I can think.

However, it may be better to use something more colorful and less concrete for maximum impact. ¿What about ¡paso! ¡paso! ¡paso! ¡paso! and let them figure out where are you coming from by the direction of the incoming voice? I think you would blend in better that way...

As Rodrigo accurately said, that sharing culture does not apply to all people in México, probably if you are driving you could use: "Comper" (short-slang expression for "con [su] permiso"), another slang: "Aguas, aguas, aguas", a little more appropriate: "Cuidado"; aggressive but effective: "Muévete" or "Quítate", but use these last two with measure and for some emergency, people could get aggressive too, in fact, if you are polite people could also react wrong with some "colorful folklore words"...

Finally, and just for completing the idea, not exactly about the question... that's if you are driving... but if you plan to walk or cycling, be careful, it could be VERY dangerous.